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CVE-2026-85724

Moquette pattern ACL wildcard injection allows cross-tenant authorization bypass

CVSS 3.1 9.6 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-85724

Published

Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, when pattern-based ACL rules are configured, AuthorizationsCollector.canDoOperation substitutes client ID and username values directly into rules containing %c or %u and then treats the result as an MQTT topic filter. A client that uses + or # in either identity can broaden the substituted filter and gain cross-tenant read and write access. A # identity can also produce an invalid filter that triggers a NullPointerException in Topic.match and disrupts session processing. This issue is fixed in version 0.18.1.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-85724

Published

moquette

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "moquette-io",
                    "product": "moquette",
                    "versions": [
                        {
                            "version": "< 0.18.1",
                            "status": "affected"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON